英文關鍵字
2019ncov
aircraft
airline
airplane
airport
alarm
aviation
background
bankruptcy
biohazard
business
corona
coronavirus
covid
covid19
crisis
danger
dangerous
disease
epidemic
fever
flight
flu
fly
flying
global
health
hit
hitting
illness
industry
infection
influenza
medicine
model
outbreak
pandemic
paper
plane
pneumonia
quarantine
respiratory
risk
sars
tourism
transport
transportation
travel
virus
world